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Find the area of an equilateral triangle with side of length 18. (Round your answer to one decimal place.)
 one year ago
 one year ago
Find the area of an equilateral triangle with side of length 18. (Round your answer to one decimal place.)
 one year ago
 one year ago

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ludwig457Best ResponseYou've already chosen the best response.1
Area= 1/2 base x height tan(60)=h/18 h=18tan(60) right?
 one year ago

ludwig457Best ResponseYou've already chosen the best response.1
should i be using law of sines
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
why use law of sines?
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
wait...by law of sines do you mean \[\frac{a}{\sin A} = \frac b{\sin B} = \frac c{\sin C}\]
 one year ago

ludwig457Best ResponseYou've already chosen the best response.1
yes, i have three angles (60) and three sides) so the how would i then find the height
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
use pythagorean theorem...you have equilateral triangle dw:1352707222314:dw
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
so the height would cut your triangle into two equal parts..dw:1352707262694:dw can you see how to get the height now?
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
now use your 1/2 bh
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
by the way.. you can also use your solution a while ago... 18tan (60) you don't need law of sines...just use a calculator for that
 one year ago

ludwig457Best ResponseYou've already chosen the best response.1
and that solution from earlier would then give me the height?
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
hmm wait...something's wrong with it...let me find it first
 one year ago

ludwig457Best ResponseYou've already chosen the best response.1
should it be 9 instead of 18
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
yes it should be 9
 one year ago
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